Pressure-reducing valve.



PATELITEP FEB. 18. 1908.

W. V. TURNER. PRESSURE REDUCING VALVE.

APPLICATION FILED JULY 14.1934.

221M; 4. mm

am-urn Quads -i i l- WALTLR V. TURNER, OF WILKINSBURG, PLUXBYLYANIA. ASSIGNOR TO THE WESTINGHQUSE AIR BRAKE COMPAN 1", OF PITlSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYL- VAII IA.

PRESSUREJIEDUCZNG VAL ada ted to be located between a source of 5 fiui supply and a pipe or chamber, wherein it is desired to maintain the fluid at a substantially constant degree of pressure which is less than that (l the source of supply.

More particula 'ly the invention relates to that class of these de ices in v-hich the main valve for controllhr the flow of lluid is operated by a piston. the pressure upon one side of which is controlled by an aux liary pressure 5 device, such'as a snudl valve and diaphragm 5 which is subject to the pressure of the pipe or chamber in .which the constant'prcssure is'to be maintained on the outlet side of the main valve.

As applied to the regulation of certain fluids, 'such as air or steam for certain purposes Where a slight leakage to the atmosphere is not objectionable, it. is often desirable that the main valve should be. normally open, that is when the lluid pressures upon opposite sides of the main piston are sub stantinlly equal and the rcssure on the outlet side is less than that t esigned to be maintained. It is also desirable that when the pressure upon the outletside rises to the desired degree for which the device is adjusted that the main valve should close positively and be held closed by the higher pressure of the inlet side or source of supply acting on one side of the main valve piston. According to my invention, these results are secured by providing a main valve and piston constantly subject upon one sideto the high inlet pressure from the source of fluid supply which is adapted to leak around to the chambet on the 0 )posite side of the piston from which a small vent to the atmosphere is controlled by an auxiliary valve and diaphragm subject to the pressure on the outlet side of the main valve.

In the accompanying drawing, which shows in section a valve device embodying my invention, the main valve chamber 4 is in constant open communication with the inlet Specification of Letters Patent.

Application filed July Hi i904. Serial No. 216.517.

Patented Feb. 18, 1908. i

l or source of supply, while the main valve a, which is shown in the form of a slide valve,

controls a port leading to the outlet 2.

The main valve is o erat-ed by the piston 5, which is subject to tlie inlet pressure upon the val e chamber side and to pressure of chamber 6- upon the opposite side, the chamher 6 being supplied with fluid from the inlet 1 by leakage a ound piston 5 and having a vent port 15 leading to the atmosphere controlled by auxiliary or regulating valve 8 actuated by diaphragm 9 through stem 16. The diaphragm chamber 10 communicates through port orpassage 11 with the outlet side 2 of the main alve and the pressure on said diaphragm is opposed by the spring 12 having adjusting nut 13, the chamberbeing UNITED STATES PATENT OFFICE.

closed by cap nut 14. When there is no pressure on the inlet side of the valve, or when the main piston is balanced as to fluid pressure upon its opposite sides, the spring 7' norma ly holds the main valve 'wide 0 en and this comprises one of the important eatures of my invention.

The operation of my improved fluid pressure regulator is as follows: When the pressure upon the outlet side is less than that for which the spring 12 is adjusted the diaphragm stem is held above the stem 16 and the regulating or vent valve 8 is held closed by means of a light spring 17 and the fluid pressure in chamber 6. This chamber being closed the pressure from the inlet 1 readily equullzes around the piston 5, so that the same is balanced as to fluid pressure and the spring 7 holds the main valve open, thereby feeding up the pressure in the chamber at theoutlet 2 and also through assage 11 into the diaphragm chamber 10. Then this pressure has increased to a degree sullicient to C0111? press the spring 12 the regulating Q1 vent valve 8 opened slightly by the stem 16 and iluid from chamber 6 escapes through ort 15 to the atmosphere. As it requires 0 y" a slight, opening of valve 8 to vent fluid from chamber 6 to the atmosphere faster than it can be supplied by leaking around the iston 5, the high pressure upon the inlet si e immediatel predominates and forces the piston up against the 5 ring 7, thereby closing the main valve quio y and positively. As long as the pressure upon the outlet side remains at the desired degree the valve 8 stands slight-l open and there is a. slight leakage from t re inlet around piston 5 to chamber 6 and out through valve 9 and port l?) to the l atmosphere. the main valve being held ('losed by the inlet pressure aetiug on the piston 5. 1 \l'hen'the pres ure upon the outlet side l'alls below the desired degree the spring 1; raises l the diaphragm stem 'l'roin the stem lll and allows the regulating: r vent valve 8 to (-lose. 'lhe inlet pressure then immediately eqnalizes upon opposite sides of the piston aiul the spring I open the main valve. ll for an reason th inl t pressure should hill or beeome redueed ld'l that upon the outlet 5 side as determined lv the spring 12, the main valve is held open hv the spring 7 sinee. the piston 5 remains l ttinllt'ttl as to fluid pressure and the fluid i then tree to flow baek through the val\e l'rom the outlet side to the inlet side without raising the'valve from its seat, \vhieh is an important and desirable feature, especially when used in eouueetion ith a slide valve.

lu eertain applieatit'ins ot' a valve device of this eharaeter, as for instanee in an air brake system, it. is desirable that the main \alve should remain snbsta-ntiall wide open. 1 when the outlet side is being reeharged, until 5 the outlet pressure ha im-reased to about the point at \vhieh the spring is adjusted, and then be (ptit'klv and positively i-losed.

The important features of my invent on: whereby their advantageous results are obtaint-d, roniprisethe venting of the pressure ehainbtt; to the atmosphere. \vherebv the l fluid l a v dist-barge ]'it])ttll from said ham- 3 bet tvlu-never th regulating or vent valve N l is open, the vent valubeing adapted to be opepet'l by the diaphragm when the outlet l prpssure has risen .to the predetermined l amount whereby the main val\e is held in its (lUSttl position by the preptmderanee ol' pressure upon the inlq't side of the main valve, piston.

llaving nmv deseribed my invention. but I elaim as new and desire to seeure by Letters i Patent is:

l. A fluid pressure regulator t-omprising a main valve for eontrolliug the flo\v of fluid, a movable abutment having equal areas exposed to fluid pressure on its opposite sides for operating said valve, a. spring normally tending to move said valve to its open po- 1 sition, and a regulating valve operated v variations in the fluid pressure for eontrolling the rel ase of fluid from one side of said abutment.

12. fluid pressure rognlator eomprising a lnain valve for eontrolliitg the llo\\' of fluid. a

movable abutm nt having equal areas ex posed to fluid res ure on its op osite sides 1 for operating said valve. a spring normallv tending to move said valve to its open rosition, a regulating valve for controlling the pressure on one side of said abutment, and

means governed by the outlet, pressure for operating said regulating valve.

3. A. fluid pressur regulator comprising a main slide valve for bntrolling the flow of fluid, a movable. abutment having equal areas exposed to fluid pressure on its o-mosite sides for operating said valve mean. tmally tending to open said valve, a regulating valve eontrolling the pressure on one side of said abutment. and teams governed by the outlet pressure [or -.=perating the regulat-. ing valve.

4. A fluid pressure regulator comprising a main slide valve for controlling the flo\ of fluid, a movable abutment having e ual areas exposed to fluid pressure on its opposite sides for operating said valve, a spring normally tending to ope" said valve, aregulating valve [or controllin the release of fluid from one side of the abutment, and a diaphragm subjeet to the "pposing pressures of the outlet fluid and an adjustable spring for operating said regulating valve.

A fluid pressure regulator eomprising a main slide valve subject to the high pressure for ('ontrolling the flow of fluid, a piston also. exposed on one side to the high pressure for operating said valve, means for permitting a 5 leakage of thud to the piston rhamber on the opposite side, a spring normally acting to move said slide valve to its open position, a

regulating or vent valve for controlling the release of fluid from the piston chamber, and means governed by the outlet pressure for operating the regulating val e.

ti. pX'tSSHl redut'lllg' valve t'onipllslitg a main valve. a piston subjeet on one side to the inlet pressure for elosing said valve. means for permitting an equalization of th pressure around said piston, a'spring for normally holding the main valve open, a ven valve for releasing fluid from the opposite side, of said piston to the atmosphere. :1 spring aeting on said vent valve and means governed by the utlet pressure for operating said vent valve.

7. A pressure redut-ing valve eompi'ising a main valve and piston subjeet on one side to the inlet pressure for (losing said valve. means for permitting an equalization of presure around said piston, a devi--e normallv tending to hold said valve in its open position. a vent valve for releasing fluid from the opposite side of the piston, a spring aeting on said vent, valve and a diaphragm subjeet. to the outlet pressure for eontrolling said vent valve.

ln testimony \vhereol l have hereunto set my hand.

\YAliTElt V. TI RNEhQ Witnesses:

lt. l". Enanv,

' JAS. B. MACDONALD.

iio 

